It's beautiful!
Keep in mind that you'll need to get a wedding band as well, so just make sure the band goes with the engagement ring. An infinity band (which has diamonds around the whole thing) would probably go very well or a band that has diamonds around half of it would work too.
I ended up with I loving call a franskinstein ring, as the hubby bought a beautiful engagement ring, then we had to find a sort-of matching band, then we bought another band for our 5 year anniversary. I love it to pieces, but start looking at wedding bands now and if you have a hard time finding a wedding band to match the engagement ring, you might want to consider looking into getting a wedding ring set, which comes with both the engagement ring and the wedding band. Often times they are intertwined for a really nice finished look. Good luck and early congrats!